Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy)

Kenji Yoshii, Yusuke Hiramitsu, Yuka Okajima, Yasuhiro Yoneda, Yasuo Nishihata, Jun'Ichiro Mizuki, Akio Nakamura, Yutaka Shimojo, Yoshinobu Ishii, Yukio Morii, Naoshi Ikeda

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Abstract

Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.

Original languageEnglish
Pages (from-to)1574-1580
Number of pages7
JournalMaterials Research Bulletin
Volume45
Issue number11
DOIs
Publication statusPublished - Nov 2010

Keywords

  • A. Oxides
  • C. Neutron scattering
  • D. Dielectric properties
  • D. Magnetic properties
  • E. EXAFS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Yoshii, K., Hiramitsu, Y., Okajima, Y., Yoneda, Y., Nishihata, Y., Mizuki, JI., Nakamura, A., Shimojo, Y., Ishii, Y., Morii, Y., & Ikeda, N. (2010). Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy). Materials Research Bulletin, 45(11), 1574-1580. https://doi.org/10.1016/j.materresbull.2010.07.024